<section>
  <h2>CTA - Default</h2>
  <div class="neumorphic variation1">
    <span><strong>★</strong></span>
  </div>
</section>
<section>
  <h2>CTA - Pressed</h2>
  <div class="neumorphic neumorphic--pressed variation1 pressed">
    <span><strong>★</strong></span>
  </div>
</section>

<section>
  <h2>Toggle - Default</h2>
  <div class="neumorphic variation2">
    <span><strong>Auto</strong></span>
  </div>
</section>
<section>
  <h2>Toggle - Pressed</h2>
  <div class="neumorphic neumorphic--pressed variation2 pressed">
    <span><strong>Auto</strong></span>
  </div>
</section>
body {
  padding: 3rem 4rem 0;
  background-color: #e0e0e0;
  color: #999;
  display: flex;
  flex-wrap: wrap;
  max-width: 680px;
  font-family: "Arial", sans-serif;
  margin: 0 auto;
}

section {
  flex: 1 1 50%;
  padding-bottom: 3rem;
}

h2 {
  margin-top: 0;
  margin-bottom: 1.5rem;
}

* {
  box-sizing: border-box;
}

.neumorphic {
  box-shadow: 12px 12px 24px 0 rgba(0, 0, 0, 0.2),
    -12px -12px 24px 0 rgba(255, 255, 255, 0.5);
  font-size: 5rem;
  width: 200px;
  height: 200px;
  border-radius: 40px;
  overflow: hidden;
  padding: 1.3rem;
  display: flex;
}

.neumorphic--pressed {
  box-shadow: inset 6px 6px 10px 0 rgba(0, 0, 0, 0.2),
    inset -6px -6px 10px 0 rgba(255, 255, 255, 0.5);
}

.variation1 {
  background: linear-gradient(
    -45deg,
    rgba(0, 0, 0, 0.2),
    rgba(255, 255, 255, 0.3)
  );
}

.variation1 span {
  display: flex;
  align-items: center;
  text-align: center;
  width: 100%;
  height: 100%;
  border-radius: 100%;
  overflow: hidden;
  padding: 0.65rem;
  box-shadow: inset 8px 8px 16px 0 rgba(0, 0, 0, 0.2),
    inset -8px -8px 16px 0 rgba(255, 255, 255, 0.4);
}

.variation1 strong {
  display: flex;
  align-items: center;
  text-align: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  border-radius: 100%;
  overflow: hidden;
  background-color: #f13c20;
  color: white;
}

.variation1.pressed strong {
  background-color: #bb3c20;
}

.variation2 {
  justify-content: space-around;
  align-items: center;
}

.variation2 span {
  display: block;
  padding-bottom: 1.5rem;
  position: relative;
  font-size: 3rem;
}

.variation2 span::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  display: block;
  height: 0.3rem;
  border-radius: 1rem;
  width: 50%;
  margin: 0 auto;
  background-color: currentColor;
}

.variation2.pressed {
  color: #5ab9ea;
}

External CSS

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External JavaScript

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